在服务器端渲染中,是否需要我们将应用程序结构渲染两次?在下面的 server.js 文件中,应用程序结构被渲染并发送到客户端。虽然完整的代码已经由 Server.js 生成,但是 Client.js 通过调用 render 函数再次进行渲染。
所以,根据我的理解,应用程序的最终结构是: SERVER.js(呈现 HTML、获取初始状态并将其设置在PRELOADED_STATE变量中,使用 renderFullPage 函数呈现页面) ==> CLIENT.js(使用PRELOADED_STATE变量呈现应用程序结构)
如果我理解错误,请指出。如果没有问题,我们不能只做一次吗? Server.js
所以,根据我的理解,应用程序的最终结构是: SERVER.js(呈现 HTML、获取初始状态并将其设置在PRELOADED_STATE变量中,使用 renderFullPage 函数呈现页面) ==> CLIENT.js(使用PRELOADED_STATE变量呈现应用程序结构)
如果我理解错误,请指出。如果没有问题,我们不能只做一次吗? Server.js
import path from 'path'
import Express from 'express'
import React from 'react'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import counterApp from './reducers'
import App from './containers/App'
import { renderToString } from 'react-dom/server'
const app = Express()
const port = 3000
// This is fired every time the server side receives a request
app.use(handleRender)
// We are going to fill these out in the sections to follow
function handleRender(req, res) { /* ... */ }
function renderFullPage(html, preloadedState) { /* ... */ }
app.listen(port)
function handleRender(req, res) {
// Create a new Redux store instance
const store = createStore(counterApp)
// Render the component to a string
const html = renderToString(
<Provider store={store}>
<App />
</Provider>
)
// Grab the initial state from our Redux store
const preloadedState = store.getState()
// Send the rendered page back to the client
res.send(renderFullPage(html, preloadedState))
}
function renderFullPage(html, preloadedState) {
return `
<!doctype html>
<html>
<head>
<title>Redux Universal Example</title>
</head>
<body>
<div id="root">${html}</div>
<script>
window.__PRELOADED_STATE__ = ${JSON.stringify(preloadedState)}
</script>
<script src="/static/bundle.js"></script>
</body>
</html>
`
}
Client.js
import React from 'react'
import { render } from 'react-dom'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import App from './containers/App'
import counterApp from './reducers'
// Grab the state from a global injected into server-generated HTML
const preloadedState = window.__PRELOADED_STATE__
// Create Redux store with initial state
const store = createStore(counterApp, preloadedState)
render(
<Provider store={store}>
<App />
</Provider>,
document.getElementById('root')